Exact-Feedback-Linearization-Based Adaptive Second-Order Sliding Mode Control Design for DC–DC Boost Converters
Jinlin Sun, Jun Xia, Shihong Ding, Xinghuo Yu
Abstract
The voltage regulation system of a boost converter operating in continuous conduction mode is a typical nonminimum phase system, posing significant challenges for the corresponding controller design. In this article, we employ the exact feedback linearization technique to effectively mitigate the complexities arising from the nonminimum phase characteristic. To address the voltage regulation challenge inherent to the boost converter with various disturbances, we propose an adaptive second-order sliding mode (SOSM) controller formulated within the Lyapunov framework. By dynamically modulating the control gain, the proposed controller circumvents the overestimation issue typical in other SOSM approaches, thereby diminishing chattering induced by excessive gain. In addition, unlike conventional adaptive SOSM methods, the proposed controller requires merely the disturbances to be bounded, without the need for the derivatives of these disturbances to be bounded. On this basis, the proposed controller ensures finite-time stability of the closed-loop system and concurrently enhances its transient response and robustness. Finally, comparative hardware experiments are conducted to demonstrate the effectiveness and superiority of the proposed controller.